Because the canvas remained attached to the framework, retractable awnings allowed a more flexible approach to shading (shopkeepers and owners could incrementally adjust the amount of awning coverage depending upon the weather conditions).
On the other hand, Attrition wounds are caused by rubbing or friction like grinding of the teeth. 4. Abrasion occurs when one rock hit another surface. Attrition can be termed as a form of river or coastal erosion where the surface is washed away.here is also another meaning to attrition. Attrition also refers to a staff reduction in companies through usual process like resignation or retirement. Summary. 1. Abrasion is restricted to superficial destruction; attrition is not limited to such destruction. 2.
Attrition bias is a kind of selection bias caused by attrition (loss of participants), discounting trial subjects/tests that did not run to completion. It is closely related to the survivorship bias, which only the subjects that survived a process are included in the analysis.election bias is closely related to: 1  publication bias or reporting bias, the distortion produced in community perception or meta-analyses by not publishing uninteresting (usually negative) results, or results which go against the experimenter's prejudices, a sponsor's interests, or community expectations.